Lamp filament



Patented Apr. 24, 1934 UNITED STATES PATENT OFFICE Serial No. 509,025.

Renewed July 14, 1932 2 Claims. (01. 176132) The alloy is composed of Percent Nickel 33 up to 90 Chr 33% down to 5 Molybdenum 33 V; down to 5 In producing the above alloy, the desired quantitles and proportions of the metals are placed in a crucible and covered with ground carbon and borax, the latter as a flux. The same is then heated, melted and mixed in the usual way until the various component metals are thoroughly commingled.

The same can then be molded in shapes or drawn into wire as may be desired.

It has been found in practice that if chromium and molybdenum are of equal amounts, that the nickel can be increased from 33 up to 90% of the bulk without in any way materially changing the desired characteristics of the alloy.

Under acid and temperature tests this alloy reacts similarly-to platinum, and therefore can be employed or used in the electrical or kindred arts where platinum is desirable but too expensive.

What is claimed is: v

1. A lamp filament composed of nickel 33/3% to chromium 33%% down to 5%; and molybdenum Slit down to 5%, the chromium and molybdenum always being of equal percentages and' in which the alloy thus composed has substantially the qualities of platinum.

2, A lamp filament composed of nickel, chromium and molybdenum, and in which the nickel is 33 to 90%, and in which the chromi- 75 um and molybdenum are always of equal percentages.

. DAVID PELTON MOORE.

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